<s>
The	O
Strategic	O
Air	O
Command	O
DIgital	O
Network	O
(	O
SACDIN	B-General_Concept
)	O
was	O
a	O
United	O
States	O
military	O
computer	O
network	O
that	O
provided	O
computerized	O
record	O
communications	O
,	O
replacing	O
the	O
Data	O
Transmission	O
Subsystem	O
and	O
part	O
of	O
the	O
Data	O
Display	O
Subsystem	O
of	O
the	O
SAC	O
Automated	O
Command	O
and	O
Control	O
System	O
.	O
</s>
<s>
SACDIN	B-General_Concept
enabled	O
a	O
rapid	O
flow	O
of	O
communications	O
from	O
headquarters	O
SAC	O
to	O
its	O
fielded	O
forces	O
,	O
such	O
as	O
B-52	O
bases	O
and	O
ICBM	O
Launch	O
Control	O
Centers	O
.	O
</s>
<s>
Major	O
portions	O
of	O
SACDIN	B-General_Concept
were	O
developed	O
,	O
engineered	O
and	O
installed	O
by	O
the	O
International	O
Telephone	O
and	O
Telegraph	O
(	O
ITT	O
)	O
company	O
,	O
under	O
contract	O
to	O
the	O
Electronic	O
Systems	O
Center	O
.	O
</s>
<s>
The	O
restructured	O
program	O
was	O
renamed	O
SAC	O
Digital	O
Network	O
(	O
SACDIN	B-General_Concept
)	O
,	O
and	O
was	O
formulated	O
to	O
meet	O
SAC	O
's	O
minimum	O
essential	O
data	O
communications	O
requirements	O
,	O
but	O
also	O
had	O
the	O
capability	O
to	O
grow	O
in	O
a	O
modular	O
fashion	O
.	O
</s>
